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TPS40140 Datasheet(PDF) 39 Page - Texas Instruments

Part No. TPS40140
Description  TPS40140 Dual or 2-Phase, Stackable Controller
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS40140 Datasheet(HTML) 39 Page - Texas Instruments

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R2
R1
R2
+
L1
R1 R2
DCR
C1
=
´
R1
L1
DCR
C1
To CSRTx
To CSx
R2
VOUT
VIN
+
VC
−
(
)
OUT
C
IN
OUT
OC
SW
IN
V
1
V
V
V
I
DCR
2
R1 C1 f
V
=
´
-
´
+
´
´
´
´
L1
R1
DCR
C1
=
´
R1
L1
DCR
C1
To CSRTx
To CSx
VOUT
VIN
+
VC
−
TPS40140
www.ti.com
SLUS660I – SEPTEMBER 2005 – REVISED JANUARY 2015
Figure 38. Inductor DCR Current Sense Approach
The inductor L1 consists of inductance, L, and resistance, DCR. The time constant of the inductor: L / DCR
should equal the R1 × C1 time constant. Then choosing a value for C1 (0.1
μF is a good choice) solving for R1 is
shown in Equation 17.
(17)
The voltage into the current sense amplifier of the controller , VC, is calculated in Equation 18.
(18)
As the DC load increases the majority of the voltage, VC, is determined by (IOC ×DCR), where IOC is the per
phase DC output current. It is important that at the overcurrent set point that the peak voltage of VC does not
exceed 60 mV, the maximum differential input voltage. If the voltage VC exceeds 60 mV, a resistor, R2,can be
added in parallel with C1 as shown in Figure 39. Adding R2 reduces the equivalent inductor DCR by the ratio
shown in Equation 20
Figure 39. Using Resistor R2 to Reduce the Current Sense Amplifier Voltage
The parallel combination of R1 and R2 is shown in Equation 19.
(19)
The ratio shown in Equation 20 provides the required voltage attenuation.
(20)
Copyright © 2005–2015, Texas Instruments Incorporated
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